Dear Sir or Madam,

I have a question about performing PCA method on the gene expression data.
If I have a training dataset and I identified a smaller set of genes as
biomarkers to predict case and control status.... What if I only select
those genes from the validation dataset and make some prediction of the
case-control status  with the loadings of each gene in that smaller set of
biomarkers?

Thanks very much.

best,
Xiaowei

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